What causes the red nose. The red nose is considered to be caused by the following two conditions: first, acarid dermatitis caused by acarid infection. The skin disease caused by mite infection is also called rosacea, or rosacea. In terms of treatment, some drugs can be used externally, such as clindamycin gel, benzoyl peroxide gel, chloramphenicol lotion, sulfur preparation, metronidazole gel, etc. Second, it is the red nose caused by folliculitis caused by bacterial infection at the nose, which is often caused by staphylococcal infection. Antibacterial ointment is also used for treatment, and Baiduobang ointment or fusidic acid ointment can be applied externally for treatment. In serious cases, some antibiotics can be taken orally, such as roxithromycin capsules or cefuroxime axetil dispersible tablets.